twitter.php

/**
 * Create HTML anchor tags replacing URL's
 * 
 * @param string $input
 * @param string $target anchor target attribute
 * @return string
 */
function parseLinks($input, $target = '_blank') {
	return preg_replace('#(^|\s)((?:http|https|ftp)://.+?\.[a-z]{2,3}.*?)(\s|$)#i', '$1<a href="$2" target="' . $target . '">$2</a>$3', $input);
}

function parseUsers($input, $target = '_blank') {
	return preg_replace('#\b@([\w-]+)\b#i', '<a href="http://www.twitter.com/$1" target="' . $target . '">$1</a>', $input);
}